[8:41am]  <mccoy@brahms> cat date.h
// date.h
// declaration of data class
// member functions in data.cc
// Problem 7.7 in D&D

// prevent multiple inclusions of header file
#ifndef date_h
#define date_h
class date
{
 public:
  // NOTE: three different constructors
  // each with a different TYPE or number
  // of arguments

  // constructor for the ddd yyyy format
  // note only this one has defaults
  date(int = 1, int = 1996 );
  // constructor for the  mm dd yy format
  date(int, int , int );
  // constructor for the char-mo dd yyyy format
  date(char*, int, int);
  
  // set functions
  void setmonth(int = 1);
  void setday(int = 1);
  void setyear(int = 96);

  // NOTE: const functions indicate that they 
  // do NOT change values -- can be called with
  // constant objects of type date

  // some utility functions
  // returns number of days PRIOR 
  // to the current month
  int monthToDays() const;
  // returns 4 digit representation of year
  int year4D() const;
  // returns character string representation 
  // of current month
  char* monthString() const;
  // returns the number of days in the current month
  int DaysInMonth() const;

  // some printing functions
  void printdddyy() const;
  void printmmddyy() const;
  void printdate() const;

 private:
  int month; // between 1 and 12 (inclusive)
  int day; // between 1 and 31 (inclusive)
  int year; // two digit representation between
            // 70 (for 1970) and 5 (for 2005)
};

#endif


---------------------------------------------------------------

[8:42am]  <mccoy@brahms> m date.cc
// date.cc
// Problem 7.7 in D&D
// member functions definitions for date class

#include <iostream.h>
#include <string.h>
#include "date.h"

// constructor functions to initialize private data
// default value for date is 1/1/96

// constructor for the ddd yyyy format
date::date(int ddd, int yr)
{
  int mo, moDays = 0;

  if (yr >= 2000)
    setyear(yr - 2000);
  else
    setyear(yr - 1900);

if ((ddd < 1) || (ddd > 365))
  {
    setmonth(ddd);
    setday(ddd);
  }
else
  {
    for (mo = 1; (moDays < ddd); mo++)
      {
        setmonth(mo);
        moDays += DaysInMonth();
      }

    moDays -= DaysInMonth();
    setmonth(mo - 1);
    setday(ddd - moDays);
  }
}

// constructor for the  mm dd yy format
date::date(int mm, int dd, int yy)
{
  setmonth(mm);
  setday(dd);
  setyear(yy);
}

// constructor for the char-mo dd yyyy format
date::date(char* mo, int dy, int yr)
{
  int m;

  if (yr >= 2000)
    setyear(yr - 2000);
  else
    setyear(yr - 1900);

  setmonth(m = 1);

//  if ((mo != "January") || (mo != "February") || (mo != "March") ||
//      (mo != "April") || (mo != "May") || (mo != "June") ||
//      (mo != "July") || (mo != "August") || (mo != "September") ||
//      (mo != "October") || (mo != "November") || (mo != "December"))
//    mo = "January";

  while (strcmp(monthString(), mo) != 0)
    {
      cout << "In while loop in constructor function, ";
      cout << "m = " << m;
      cout << " monthString() = " << monthString() << endl;
      cout << " mo = " << mo << endl;
      cout << "\t strcmp(monthString(), mo) = " << strcmp(monthString(), mo);
      cout << endl;
      if (m > 12)
        {
          m = 1;
          mo = "January";
        }
      else
        setmonth(++m);
    }

  setday(dy);
}
  
// set functions
void date::setmonth(int mo)
{
  month = ((mo > 0) && (mo <= 12)) ? mo : 1;
}

void date::setday(int dy)
{
  day = (dy > 0 && dy <= 31) ? dy : 1;
}

void date::setyear(int yr)
{
  year = ((yr >= 70 && (yr < 100)) || 
          (yr >= 0) && (yr <=5)) ? yr : 96;
}

// some utility functions
// returns number of days PRIOR to the current month
int date::monthToDays() const
{
  int thismo;
  date temp;

  if (month == 1)
    return 0;

  switch(month)
    {
    case 2:
      thismo = 28;
      break;
    case 4: case 6: case 9: case 11:
      thismo = 30;
      break;
    default:
      thismo = 31;
      break;
    }

  temp.setmonth(month - 1);
  thismo += temp.monthToDays();
  return thismo;
  
}

// returns 4 digit representation of year
int date::year4D() const
{
  if (year < 70)
    return (2000 + year);
  else
    return (1900 + year);
}

// returns character string representation of current month
char* date::monthString() const
{
  char* months[] = {" ", "January", "February", "March",
                    "April", "May", "June", "July", "August",
                    "September", "October", "November", "December"};

  return months[month];
}

// returns the number of days in the current month
int date::DaysInMonth() const
{
  int days[] = {0, 31, 28, 31, 30, 31, 30, 31, 31, 30, 31, 30, 31};

  return days[month];
}

// some printing functions
void date::printdddyy() const
{
  int daytotal;

  daytotal = monthToDays() + day;
  if (daytotal < 10)
    cout << "00";
  else
    if (daytotal < 100)
      cout << "0";
  cout << daytotal;
  cout << " ";
  cout << year4D();
  cout << endl;
}

void date::printmmddyy() const
{
  cout << month << "/" << day << "/" << year << endl;
}

void date::printdate() const
{
  cout << monthString() << " " << day << ", "
       << year4D() << endl;
}


-------------------------------------------------------------

[8:43am]  <mccoy@brahms> m 22-date.cc
// driver program to test date class
// Problem 7.7 in D&D

#include <iostream.h>
#include "date.h"

main ()
{
  date d1;


  cout << "Date d1:" << endl;  
  d1.printdddyy();
  d1.printmmddyy();
  d1.printdate();
  cout << endl;

  date  d2(345, 1987);

  cout << "Date d2:" << endl;  
  d2.printdddyy();
  d2.printmmddyy();
  d2.printdate();
  cout << endl;

  date d3(10, 12, 84);

  cout << "Date d3:" << endl;  
  d3.printdddyy();
  d3.printmmddyy();
  d3.printdate();
  cout << endl;

  date d4("May", 16, 87);

  cout << "Date d4:" << endl;  
  d4.printdddyy();
  d4.printmmddyy();
  d4.printdate();
  cout << endl;

  date d5(555,9999);

  cout << "Date d5:" << endl;  
  d5.printdddyy();
  d5.printmmddyy();
  d5.printdate();
  cout << endl;

  date d6("may", 555,9999);

  cout << "Date d6:" << endl;  
  d6.printdddyy();
  d6.printmmddyy();
  d6.printdate();
  cout << endl;


  return 0;
}

--------------------------------------------------------------

[8:44am]  <mccoy@brahms> CC 22-date.cc date.cc
22-date.cc:
date.cc:
[8:44am]  <mccoy@brahms> a.out
Date d1:
001 1996
1/1/96
January 1, 1996

Date d2:
345 1987
12/11/87
December 11, 1987

Date d3:
285 1984
10/12/84
October 12, 1984

In while loop in constructor function, m = 1 monthString() = January
 mo = May
         strcmp(monthString(), mo) = -3
In while loop in constructor function, m = 2 monthString() = February
 mo = May
         strcmp(monthString(), mo) = -7
In while loop in constructor function, m = 3 monthString() = March
 mo = May
         strcmp(monthString(), mo) = -7
In while loop in constructor function, m = 4 monthString() = April
 mo = May
         strcmp(monthString(), mo) = -12
Date d4:
136 1996
5/16/96
May 16, 1996

Date d5:
001 1996
1/1/96
January 1, 1996

In while loop in constructor function, m = 1 monthString() = January
 mo = may
         strcmp(monthString(), mo) = -35
In while loop in constructor function, m = 2 monthString() = February
 mo = may
         strcmp(monthString(), mo) = -39
In while loop in constructor function, m = 3 monthString() = March
 mo = may
         strcmp(monthString(), mo) = -32
In while loop in constructor function, m = 4 monthString() = April
 mo = may
         strcmp(monthString(), mo) = -44
In while loop in constructor function, m = 5 monthString() = May
 mo = may
         strcmp(monthString(), mo) = -32
In while loop in constructor function, m = 6 monthString() = June
 mo = may
         strcmp(monthString(), mo) = -35
In while loop in constructor function, m = 7 monthString() = July
 mo = may
         strcmp(monthString(), mo) = -35
In while loop in constructor function, m = 8 monthString() = August
 mo = may
         strcmp(monthString(), mo) = -44
In while loop in constructor function, m = 9 monthString() = September
 mo = may
         strcmp(monthString(), mo) = -26
In while loop in constructor function, m = 10 monthString() = October
 mo = may
         strcmp(monthString(), mo) = -30
In while loop in constructor function, m = 11 monthString() = November
 mo = may
         strcmp(monthString(), mo) = -31
In while loop in constructor function, m = 12 monthString() = December
 mo = may
         strcmp(monthString(), mo) = -41
In while loop in constructor function, m = 13 monthString() = January
 mo = may
         strcmp(monthString(), mo) = -35
Date d6:
001 1996
1/1/96
January 1, 1996